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493. Concerning the interpretation of observations, obtained from records and experiments, on milking dairy cows

Published online by Cambridge University Press:  01 June 2009

C. P. Cox
C. P. Cox
Affiliation:
National Institute for Research in Dairying, University of Reading
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Extract

1. Some questions concerning the interpretation of observations on milking dairy cattle are considered.

2. A formula is presented for analysing the contributions of changes in the numerator and denominator to the changes in a percentage or fraction, and the formula is applied to changes in the composition of milk.

3. The depressions of the butterfat and solids-not-fat percentages consequent on diets reduced in hay in a dairy-cattle feeding experiment are examined with this constituent analysis.

The contributions of changes in the magnitudes of the aqueous, butterfat and solids-not-fat constituents to the difference between the butterfat percentages of cows on two treatments, 18 lb. hay/day (control) and 6 lb. hay /day, are about equal. There is an apparent qualitative difference between the effects of the two non-control treatments, and a reduced yield of butterfat would alone largely account for the lower butterfat percentage of cows on the 2 lb. hay /day treatment.

Type
Original Articles
Information
Journal of Dairy Research , Volume 20 , Issue 1 , February 1953 , pp. 1 - 12
Copyright
Copyright © Proprietors of Journal of Dairy Research 1953

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References

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